Alright, let's work through 20838488 times 80549893 step by step
20838488 × 80549893 = 80549893 × (20838488)
+ 80549893 × 8 resulting in 644399144
+ 80549893 × 80 which equals 6443991440
+ 80549893 × 400 producing 32219957200
+ 80549893 × 8000 that equals 644399144000
+ 80549893 × 30000 yielding 2416496790000
+ 80549893 × 800000 producing 64439914400000
+ 80549893 × 0000000 which equals 0
+ 80549893 × 20000000 which equals 1610997860000000

= 1678537978681784
